Toshiba MMD-AP0481HF2UL Service Manual page 34

Check function for operation of indoor unit (Functions at indoor unit side)
This function is provided to check the operation of the indoor unit singly without communication with the
remote control or the outdoor unit. This function can be used regardless of operation or stop of the system.
However, if using this function for a long time, a trouble of the equipment may be caused. Limit using this
function within several minutes.
[How to operate]
1) Short-circuit CHK pin (CN071 on the indoor P.C. board).
The operation mode differs according to the indoor unit status in that time.
Normal time: Both float SW and fan motor are normal.
Abnormal time: Either one of float SW or fan motor is abnormal.
2) Restricted to the normal time, if short-circuiting DISP pin (CN072 on the indoor P.C. board) in addition to
short-circuit of CHK pin (CN071 on the indoor P.C. board), the minimum opening degree (30pls) can be
set to the indoor PMV only.
When open DISP pin, the maximum opening degree (1500pls) can be obtained again.
[How to clear]
Open CHK pin. While the system is operating, it stops once but automatically returns to operation after
several minutes.
Fan motor
Indoor PMV (∗) Max. opening degree (1500pls)
Communication
P.C. board LED
Normal time
DISP pin open(CN071)
(H)
All ignored
Lights
Short-circuit of CHK pin(CN071)
DISP pin short circuit(CN071)
(H)
Min. opening degree (30pls)
All ignored
Lights
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Abnormal time
Stop
Min. opening degree (30pls)
All ignored
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